Praseodymium

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Praseodymium
59Pr
-

Pr

Pa
ceriumpraseodymiumneodymium
Ìhànsójú
grayish white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà praseodymium, Pr, 59
Ẹ̀ka ẹ́límẹ̀nti lanthanide
Ẹgbẹ́, àsìkò, àdìpò n/a6, f
Ìwúwo átọ́mù 140.90765
Ìtòléra ẹ̀lẹ́ktrónì [Xe] 4f3 6s2
2, 8, 18, 21, 8, 2
Physical properties
Phase solid
Density (near r.t.) 6.77 g·cm−3
Liquid density at m.p. 6.50 g·cm−3
Melting point 1208 K, 935 °C, 1715 °F
Boiling point 3793 K, 3520 °C, 6368 °F
Heat of fusion 6.89 kJ·mol−1
Heat of vaporization 331 kJ·mol−1
Molar heat capacity 27.20 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1771 1973 (2227) (2571) (3054) (3779)
Atomic properties
Oxidation states 4, 3, 2 (mildly basic oxide)
Electronegativity 1.13 (Pauling scale)
Ionization energies 1st: 527 kJ·mol−1
2nd: 1020 kJ·mol−1
3rd: 2086 kJ·mol−1
Atomic radius 182 pm
Covalent radius 203±7 pm
Miscellanea
Crystal structure hexagonal
Praseodymium has a hexagonal crystal structure
Magnetic ordering paramagnetic [1]
Electrical resistivity (r.t.) (α, poly)
0.700 µΩ·m
Thermal conductivity 12.5 W·m−1·K−1
Thermal expansion (r.t.) (α, poly) 6.7 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2280 m·s−1
Young's modulus (α form) 37.3 GPa
Shear modulus (α form) 14.8 GPa
Bulk modulus (α form) 28.8 GPa
Poisson ratio (α form) 0.281
Vickers hardness 400 MPa
Brinell hardness 481 MPa
CAS registry number 7440-10-0
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù praseodymium
iso NA half-life DM DE (MeV) DP
141Pr 100% 141Pr is stable with 82 neutrons
142Pr syn 19.12 h β 2.162 142Nd
ε 0.745 142Ce
143Pr syn 13.57 d β 0.934 143Nd
· r

Praseodymium (pípè /ˌpreɪzi.ɵˈdɪmiəm/ PRAY-zee-o-DIM-ee-əm tabi /ˌpreɪsi.ɵˈdɪmiəm/ PRAY-see-o-DIM-ee-əm) je apilese kemika to ni ami-idamo Pr ati nomba atomu 59.


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. M. Jackson "Magnetism of Rare Earth" The IRM quarterly col. 10, No. 3, p. 1, 2000